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Toronto Homeowner’s Guide to Retrofits - Many Ways to Upgrade

August 10, 2017

Whether it’s about personal budget or home comfort, more and more homeowners are looking to improve the energy efficiency of their home. This is particularly apparent in older homes where the building envelope isn’t air tight, and the insulation is less than adequate. In these homes, heating and cooling is simply being wasted, and energy bills are higher than need be.

Old home or new, it’s been estimated that heating the home accounts for well over 50% of energy use, making for a high proportion of the overall energy bill. The good news is that homeowners can undertake a number of energy retrofits that will lessen energy use, reduce monthly bills, and improve indoor comfort. In short, a well sealed, well insulated home performs better.

Upgrading Existing Attic Insulation insulation retrofits toronto spray foam insulation

Upgrading attic insulation will immediately improve the energy efficiency of a home. Winter heating and summer cooling will be better balanced, and monthly energy use will be reduced.  And with balanced indoor temperatures, the home will be more comfortable season to season.

“Drill & Fill” Insulation Retrofitting

Drill & Fill” is an innovative approach to energy retrofitting whereby new insulation is installed into existing walls. Without damaging the wall, loose fill insulation is blown into the wall cavity to dramatically increase the thermal insulation while raising the overall R-Values throughout.

Removing Old Insulation to Upgrade

Removing old insulation and replacing with better performing material is a sure way to enhance energy efficiency. Upgrading insulation, especially in the roof and attic, will address both air leakage and thermal performance. Winter and summer, the HVAC system will perform better.

Installing or Re-Installing Air Barriers

Improper airflow throughout a home affects air moisture, oxygen levels, and air pollutants. And overall, these will affect indoor comfort. Properly installed air barriers, whether in the attic or the basement, will ensure much better air circulation and moisture control throughout the home.

Blower Door Tests can be Very Telling

Blower door tests are designed to identify air leakage points in a building structure. An in-depth test and assessment will suggest retrofits that will improve the home’s energy performance and efficiency. Blower door tests are carried our by a Certified Energy Advisor who is accredited.

Air Sealing, Draft Proofing, Ventilation

Eliminating air leakage is key to energy efficiency. A well sealed home doesn’t allow heat to escape in winter or allow heat to enter in summer. And when the home is well ventilated, overall performance is enhanced. Industry experts prefer a home that is sealed tight/ventilated right.

Toronto Homeowner’s Guide to Retrofits – an Action Plan

For those homeowners who are intent on improving energy efficiency in their home, the experts at Great Northern Insulation now offer an online service to move things forward. Homeowners can gauge their home’s energy performance online, and pinpoint areas that could be improved. With GNI, various retrofits can be recommended, and upgrades can be implemented. For more information, visit www.gni.ca or contact the office directly at 1-800-265-1914.

Western Ontario

935 Keyes Drive
Woodstock, Ontario
Canada N4V 1C3

Phone: 1-800-265-1914

Fax: (519) 539-7946
TOLL FREE: 1-800-265-1914

Southwestern Ontario

7035 Industrial Drive
Comber, Ontario
Canada N0P 1J0

TOLL FREE: 1-800-265-1914

Muskoka, Haliburton, Northern Ontario

1027 Elwell Park Road
Gravenhurst, Ontario
Canada P1P 1R1

TOLL FREE: 1-800-265-1914

Central Ontario

29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5

TOLL FREE: 1-800-265-1914

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

GTA & South Central Ontario

450 Industrial Dr,
Toronto (Milton), Ontario
Canada L9T 5A6

TOLL FREE: 1-800-265-1914

Eastern Ontario

1035 Moodie Dr #1,
Nepean, ON
K2R 1H4

TOLL FREE: 1-800-265-1914


259 Campbell Street
Sarnia Ontario
Canada, N7T 2H3

TOLL FREE: 1-800-265-1914

Niagara Region

6260 Don Murie St
Niagara Falls, ON
L2G 0B4

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.


Best of 2017

From reputation to responsiveness, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thanks to everyone for the great ratings! 

HomeStars 2018

Best of 2018

For the second year in a row, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thank you again to everyone!

Homestars Best of 2019 Award

Best of 2019

For the third year in a row, HomeStars ranked Great Northern Insulation at better than 95% for customer satisfaction.

Homestars Best of 2020 Award

Best of 2020

For four years now, HomeStars has ranked Great Northern Insulation at better than 95% for customer satisfaction.

Homestars Best of 2021 Award

Best of 2021

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2021.

Homestars Best of 2022 Award

Best of 2022

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2022.


GNI is the Authorized & Trusted Insulation and Air Sealing Installer for Lowe’s

Enenrgy Savers

Energy Saving

Energy saving and energy efficiency is easier than one might think. Great Northern Insulation helps to identify performance issues, while taking advantage of improvement opportunities.

100% Canadian

100% Canadian

Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.

Foam Masters

Do it right the first time
- with foam mastersTM

WALLTITE® ECO™ is a high-performance system, professionally installed by certified and approved specialists. Its C.C.M.C. approved (Canadian Construction Materials Centre) - with product quality guaranteed - and with installation by highly trained experts with the technical know-how to do the job right, the first time.

Insulthane Extreme

Insulthane® Extreme

For the ultimate in high performance spray foam insulation, Insulthane® Extreme is the professional choice for residential, commercial, and industrial application. With improved thermal performance over other products, Insulthane® Extreme has an exceptionally low Global Warming Potential (GWP). Considered environmentally friendly, this next generation spray foam insulation is non-ozone depleting, and exceeds specifications of other HFC product alternatives.


3MTM products.
Quality + Performance = Savings

3MTM energy-saving products are designed to keep warm air in, and cold air out, while keeping energy bills down. Products optimize energy efficiency in buildings and homes; improve indoor environment for occupants; and effect the reduction of seasonal energy costs. 3M products are authorized for LEED credits (Leadership in Energy/Environmental Design).


Baeumler ApprovedTM
Professional, Certified and Insured

Baeumler ApprovedTM gives you peace of mind when connecting with contractors, trades and home service providers. All Baeumler Approved members have demonstrated high quality work for customers and other trade professionals. Members must also have Workers Compensation, liability insurance of at least $1,000,000 and prove professional certification.

Holmes and Holmes

Holmes and Holmes


Mike Holmes and his son Mike Jr. (MJ) convert MJ’s bachelor bungalow into a two-storey home for MJ and his girlfriend Lisa. Choosing the newest materials and build techniques, the father and son team follow Mike’s famous motto – “Make it right.” The show can be watched on HGTV and DIY Network.


Enbridge Incentives

The Energy Conservation Program provides incentives of up to $1,600 to customers who achieve energy efficiency and fuel savings – and Great Northern Insulation can pave the way.


Great Northern Insulation proudly abides by a renovation-specific Code of Conduct set by RenoMark™.


We are Verified & Bonded by eRenovate. When you choose to proceed with our services through their platform, you receive the gaurantees set forth through their program.

As Seen on Love It or List It

The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?

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